At the end of part 2 of Way Of The Warrior O'Brien says to Worf: You look good in red.
Worf replies: It feels good.
They both acted like Worf had NEVER wore a red uniform. I was rewatching Angel One, my favorite Star Trek: The Next Generation season one episode. Guess what color Worf's uniform was in Angel One. If you said RED, you're correct. Now here's my question:
Were the DS9 writers stupid, forgetful or just too lazy to watch season one of Next Generation?

That's a nitpick. After seven years in yellow, switching back to red warrants a comment. Especially given O'brien and Worf never really interacted at all until after Worf was in yellow.